Name | Dichloromethane |
Synonyms | Dichloromethane |
CAS | 1975-9-2 |
Density | 1.325 g/mL at 25 °C(lit.) |
Melting Point | -97 °C |
Boling Point | 39.8-40 °C mm Hg(lit.) |
Flash Point | 39-40°C |
Water Solubility | 20 g/L (20 ºC) |
Vapor Presure | 24.45 psi ( 55 °C) |
Vapor Density | 2.9 (vs air) |
Storage Condition | room temp |
Refractive Index | n20/D 1.424(lit.) |
Physical and Chemical Properties | Pure dichloromethane has no flash point, and the solvent mixture containing equal volume of dichloromethane and gasoline, solvent naphtha or toluene is not flammable. However, when dichloromethane is mixed with acetone or methanol liquid in a ratio of 10 :1, The mixture has a flash point, vapor and air form an explosive mixture, and the explosion limit is 6.2% to 15.0% (volume). |
Use | Dichloromethane is a compound formed by the substitution of two hydrogen atoms in the methane molecule by chlorine, with the molecular formula CH2Cl2. It is a colorless, transparent, heavier than water, and volatile liquid. It has an ether-like smell and sweet taste. It does not burn, but it is mixed with high-concentration oxygen to form an explosive mixture. Dichloromethane is slightly soluble in water, miscible with most commonly used organic solvents, and miscible with other chlorine-containing solvents, ether, ethanol and N,N-dimethylformamide in any proportion. Dichloromethane is hardly soluble in liquid ammonia at room temperature, and can quickly dissolve in phenol, aldehyde, ketone, glacial acetic acid, triethyl phosphate, formamide, cyclohexylamine, ethyl acetoacetate. Relative density 1.3266(20/4°C). Melting point -95.1 c. Boiling point 40 c. Non-flammable low boiling point solvents are often used to replace flammable petroleum ether, ether, etc., and can be used as dental local anesthetics, refrigerants and fire extinguishing agents. The spontaneous ignition point is 640 c. Viscosity (20°C)0.43mPa · s. Refractive index nD(20°C)1.4244. The critical temperature is 237°C and the critical pressure is 6.0795MPa. After pyrolysis, HCl and trace phosgene are produced, which are heated with water for a long time to generate formaldehyde and HCl. Further chlorination, CHCl3 and CCl4 can be obtained. |
Risk Codes | R40 - Limited evidence of a carcinogenic effect R39/23/24/25 - R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R11 - Highly Flammable R67 - Vapors may cause drowsiness and dizziness R36/37/38 - Irritating to eyes, respiratory system and skin. R68/20/21/22 - R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R50 - Very Toxic to aquatic organisms R37 - Irritating to the respiratory system R34 - Causes burns |
Safety Description | S23 - Do not breathe vapour. S24/25 - Avoid contact with skin and eyes. S36/37 - Wear suitable protective clothing and gloves. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S16 - Keep away from sources of ignition. S7 - Keep container tightly closed. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
UN IDs | UN 1593 6.1/PG 3 |
WGK Germany | 2 |
RTECS | PA8050000 |
FLUKA BRAND F CODES | 3-10 |
TSCA | Yes |
HS Code | 2903 12 00 |
Hazard Class | 6.1 |
Packing Group | III |
Toxicity | LD50 orally in young adult rats: 1.6 ml/kg (Kimura) |